public AssetClosestDueDateCalculationResult CalculateClosestRightEndDate(Asset asset)
        {
            // if exist Custom with EndDate >= Now => get Min EndDate
            var asset =

            var assetRight = asset.Rights
                .Where(x => x.GetEndDateType() == AssetRight.EndDateType.Custom)
                .Where(x => x.GetEndDate() >= Current.DateNow())
                .OrderBy(x => x.GetEndDate())
                .FirstOrDefault();

            if (assetRight != null)
            {
                return new AssetClosestDueDateCalculationResult
                    {
                        Date = right.GetEndDate(),
                        Type = right.GetEndDateType()
                    };
            }

            // if exist Perpetual => get First EndDate
            assetRight = asset.Rights
                .Where(x => x.GetEndDateType() == AssetRight.EndDateType.Perpetual)
                .FirstOrDefault()

            assetRights = asset.Rights.Where(x => x.GetEndDateType() == AssetRight.EndDateType.Perpetual);
            if (assetRight != null)
            {
                return new AssetClosestDueDateCalculationResult
                {
                    Date = null,
                    Type = AssetRight.EndDateType.Perpetual
                };
           }

            // if Custom and EndDate < Now => get Max EndDate
            assetRight = asset.Rights
                .Where(x => x.GetEndDateType() == AssetRight.EndDateType.Custom)
                .OrderByDescending(x => x.GetEndDate())
                .FirstOrDefault();
            if (assetRight  != null)
            {
                    return new AssetClosestDueDateCalculationResult
                    {
                        Date = right.GetEndDate(),
                        Type = right.GetEndDateType()
                    };
            }

            return new AssetClosestDueDateCalculationResult
            {
                Date = null,
                Type = AssetRight.EndDateType.Undefined
            };
        }
    }